First chip-level free-space terabit/s coherent optical communication links via platicon frequency microcombs

https://www.eurekalert.org/news-releases/1085212

"data transmission rate up to 8.21 Tbit/s, remained stable under turbulence...  no large volume, high power consumption, complex phase synchronized multi-laser arrays... microcombs in free-space links limited by conversion efficiency/ power uniformity issues, overcome through spectral shaping/ efficient energy conversion, based on silicon nitride micro-ring resonator... 1.29 bit/s/Hz spectral efficiency... reduced beam position fluctuations 10X, carrier phase recovery technology... 6G, space-air/ satellite-ground-sea links"